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On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms

Rabus, Bernd and Lang, Oliver (2002) On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms. Journal of Glaciology, Vol. 48 (No. 162), pp. 345-356.

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Abstract

We investigate limitations of the one-dimensional elastic beam model to detect grounding line and thickness of an ice shelf from a differential interferogram. Spatial limitations due to grounding line curvature and variable ice thickness are analyzed by comparison with two-dimensional plate flexure. Temporal limitations from the tide-dependent shift of the grounding line are analyzed by superpositions of four tidal flexure profiles representing differential interferograms. (i) At scales greater one ice thickness seaward protrusions of the grounding line are well represented by the elastic beam model, while landward embayments of the same scale produce significant misplacements >10 per cent of the ice thickness. (ii) For reasonable spatial variations of shelf thickness the elastic beam model gives reliable estimates of grounding line position and unfractured mean ice thickness near the grounding line. (iii) For about 20 per cent of superpositions of four tidal flexure profiles the resulting grounding line misplacements exceed the physical tidal shift of the grounding line by factors >2. For differential tide levels <10 per cent of a 1 m tide dynamics, a physical shift of the grounding line of 0.3 km per meter of tide can lever misplacements of >2 km. Examples of real interferometric profiles from West Antarctic ice shelves corroborate our results.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2002,
Title:On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms
Authors:
AuthorsInstitution or Email of Authors
Rabus, BerndUNSPECIFIED
Lang, OliverUNSPECIFIED
Date:2002
Journal or Publication Title:Journal of Glaciology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:Vol. 48
Page Range:pp. 345-356
Status:Published
Keywords:Glaciology, Interferometry, Modelling
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: elib DLR-Beauftragter
Deposited On:29 Mar 2006
Last Modified:06 Jan 2010 12:15

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